    <li>Clean, easy to use user interface with advanced editor so you can study anything (simple or complex).</li>
    <li>Ability to study a deck of thousand cards by tagging.  If you are studying a book, we recommend that you use the chapter title as a tag, so that you can focus / review one chapter at a time.  Cards that you didn't know the answer are put back into the to-be-study deck so the system will show them to you again.  With tagging, you can do on-demand study anytime.</li>
